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1:". STRATNER. VALVE GEAEEOE STEAM ENGINES.

i No, 61,640. Patented Jam.v 29, 1867.

' @uitrit gratins @anni @Hita IMPROVEMENT IN VALVE GEAR FOR STEAMENGINES.`

@La rlgehulenfetret in in tiges: 'rtters iteut mit milking gno nt tigt sums.

TO ALL WHOM IT MAYLCONCERN:

Be it known vthat I, Fnnnnrc STRATNER, of Wilmington, in the county of New Castle, and State of Delaware, have invented a new and useful Improvement in Values and Valve Gear for Steam Engines; and I do hereby declare the following to be a full, clear, and exact description of the nature, construction, and operation of the sume, reference being had to the accompanying drawings, which -are made a part of this speciiication, and in.

wh i clithrough the valvechest and steam channels being indicated by the lines y.;y, fig. v2.

Figure 2 is a transverse section on the line :u g. 1.

Figure 3.illustrates a modification in the method of colnecting the pitman to the slotted segment hereinafter referred to. l

Similar letters of reference indicate corresponding parts in the several figures.

My invention consists in the arrangement of a slotted segment in connection with the valve-rod and Pitman, whereby the engine may be reversed and stopped with the greatest facility, and the speed of the valve regulated more eiectually than by other arrangements.

In order that others skilled in the art to which my invention appertains may beenabled to fully understand and use the same, I will proceed to describe it in detail in connection with the accompanying drawings.

A may represent a D-valve, working snugly within the steam-chest B and over thc'steam-ports C (land exhaust-port C of the steam cylinder. The form'of the yalve Ain its transverse section is shown in fig. 2, The sides a a of the valve converge toward the bottom, a,which is dat. '..lhe valve-seat is shaped like the valve; that is to say, the bearing surfaces of the valve seat converge' toward a ilat bottom,so as to conform to the working surfaces of the valve A.. `This valve is intendedto be strictly a balance-valve, so that the friction and wear at the bottom, a', shall not exceed that at the sides'a a. Hence the valve wears equally at all the bearing vFigure 1 is a sectional elevation of a valve and valve gear illustrating my invention, the plane vof section points, and consequently maintans a true bearing in the seat D. The ordinary flat-bottomed D-valve'undergoes` the greatest friction vand wear at the cent-ral'parthofthe bottom, which thus becoming hollow is liable to get out of order and jump E 'is a yoke, embracing the valve4 A' at top, and affording the means of connecting the same with the valve-rod A. F is a pitman, connecting the valve-rod A with a slotted segment, G, through the medium of a double link, H, and adjustable block, I, the latter being confined in the slot of the segment Gr. The segment G vibrat'es with the rook-shaft J, to which lthe eccentric-rod K may be attached directly, as shown in iig. 3, or through the medium of a vibrating arni J', as seen in fig;` 1. By adjusting the blockI to the opposite sideof the centre of the slotted segment G,*the engine is reversed; by adjusting it towardvor away from said centre, the speed of the valve is raised; andby adjusting i't at the centre of the segment, the latter may vibrate y without communicating moti'on to block I, and t/hus the motion of the valve may be readily suspended.l In the latter case the valve I serves the purpose of a throttle. These several` adjustments may be effected by a suspending rod attached to the link H and adjusted by hand, or connected with and controlled by the governor,

as may be preferred.

Having thus described my invention, the following is'lwh'at I claim-as new herein, and desire to secure by Letters Patent:

I claim the described arrangement of the slotted segment G, rock-shaft J, adjustable block I, pitman and valve-rod A', whereby the motion of the valve may be accelerated, retarded, or suspended, as set forth.'

To the above specification of improvements in valve and valve gears I have signed my hand this sixth day of July, 1866.

FREDRIC, STRATNER.

Witnesses:

W. l5'.v HALL, C. D. SiurTn. 

